Finding the Fourth Proportional to 520,086.18, 780,156 and 146,138.34

Step by Step Solution

1. Step 1: Write the proportion equation
   520,086.18 : 780,156 = 146,138.34 : x
2. Step 2: Convert to fraction form
   520,086.18/780,156 = 146,138.34/x
3. Step 3: Cross multiply
   520,086.18x = 780,156 × 146,138.34
4. Step 4: Simplify right side
   520,086.18x = 114,010,702,781.04
5. Step 5: Solve for x
   x = 114,010,702,781.04/520,086.18
6. Step 6: Final answer
   x = 219,215.02