Finding the Fourth Proportional to 2,139,351.30, 3,209,002.20 and 520,129.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139,351.30 : 3,209,002.20 = 520,129.32 : x
2. Step 2: Convert to fraction form
   2,139,351.30/3,209,002.20 = 520,129.32/x
3. Step 3: Cross multiply
   2,139,351.30x = 3,209,002.20 × 520,129.32
4. Step 4: Simplify right side
   2,139,351.30x = 1,669,096,132,164.50
5. Step 5: Solve for x
   x = 1,669,096,132,164.50/2,139,351.30
6. Step 6: Final answer
   x = 780,187.96