Finding the Third Proportional to 390,058,432 and 812,402,008

Step by Step Solution

1. Step 1: Write the proportion equation
   390,058,432 : 812,402,008 = 812,402,008 : x
2. Step 2: Convert to fraction form
   390,058,432/812,402,008 = 812,402,008/x
3. Step 3: Cross multiply
   390,058,432x = 812,402,008 × 812,402,008
4. Step 4: Simplify right side
   390,058,432x = 659,997,022,602,432,000
5. Step 5: Solve for x
   x = 659,997,022,602,432,000/390,058,432
6. Step 6: Final answer
   x = 1,692,046,546.00