Finding the Fourth Proportional to 81,401.30, 121,956.15 and 50,200.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,401.30 : 121,956.15 = 50,200.10 : x
2. Step 2: Convert to fraction form
   81,401.30/121,956.15 = 50,200.10/x
3. Step 3: Cross multiply
   81,401.30x = 121,956.15 × 50,200.10
4. Step 4: Simplify right side
   81,401.30x = 6,122,210,925.62
5. Step 5: Solve for x
   x = 6,122,210,925.62/81,401.30
6. Step 6: Final answer
   x = 75,210.24