Finding the Fourth Proportional to 99,981, 137,973.75 and 54,659.17

Step by Step Solution

1. Step 1: Write the proportion equation
   99,981 : 137,973.75 = 54,659.17 : x
2. Step 2: Convert to fraction form
   99,981/137,973.75 = 54,659.17/x
3. Step 3: Cross multiply
   99,981x = 137,973.75 × 54,659.17
4. Step 4: Simplify right side
   99,981x = 7,541,530,624.28
5. Step 5: Solve for x
   x = 7,541,530,624.28/99,981
6. Step 6: Final answer
   x = 75,429.64