Finding the Fourth Proportional to 340,311.72, 510,541.38 and 103,648.20

Step by Step Solution

1. Step 1: Write the proportion equation
   340,311.72 : 510,541.38 = 103,648.20 : x
2. Step 2: Convert to fraction form
   340,311.72/510,541.38 = 103,648.20/x
3. Step 3: Cross multiply
   340,311.72x = 510,541.38 × 103,648.20
4. Step 4: Simplify right side
   340,311.72x = 52,916,695,062.52
5. Step 5: Solve for x
   x = 52,916,695,062.52/340,311.72
6. Step 6: Final answer
   x = 155,494.78