Finding the Third Proportional to 252,013.78 and 390,128.91

Step by Step Solution

1. Step 1: Write the proportion equation
   252,013.78 : 390,128.91 = 390,128.91 : x
2. Step 2: Convert to fraction form
   252,013.78/390,128.91 = 390,128.91/x
3. Step 3: Cross multiply
   252,013.78x = 390,128.91 × 390,128.91
4. Step 4: Simplify right side
   252,013.78x = 152,200,563,491.82
5. Step 5: Solve for x
   x = 152,200,563,491.82/252,013.78
6. Step 6: Final answer
   x = 603,937.46