Finding the Fourth Proportional to 517,048,300.28, 771,018,728.92 and 512,384,905.50

Step by Step Solution

1. Step 1: Write the proportion equation
   517,048,300.28 : 771,018,728.92 = 512,384,905.50 : x
2. Step 2: Convert to fraction form
   517,048,300.28/771,018,728.92 = 512,384,905.50/x
3. Step 3: Cross multiply
   517,048,300.28x = 771,018,728.92 × 512,384,905.50
4. Step 4: Simplify right side
   517,048,300.28x = 395,058,358,556,404,288
5. Step 5: Solve for x
   x = 395,058,358,556,404,288/517,048,300.28
6. Step 6: Final answer
   x = 764,064,707.96