Finding the Fourth Proportional to 100,061.76, 149,895.41 and 81,362.91

Step by Step Solution

1. Step 1: Write the proportion equation
   100,061.76 : 149,895.41 = 81,362.91 : x
2. Step 2: Convert to fraction form
   100,061.76/149,895.41 = 81,362.91/x
3. Step 3: Cross multiply
   100,061.76x = 149,895.41 × 81,362.91
4. Step 4: Simplify right side
   100,061.76x = 12,195,927,366.20
5. Step 5: Solve for x
   x = 12,195,927,366.20/100,061.76
6. Step 6: Final answer
   x = 121,883.99