Finding the Fourth Proportional to 91,411.98, 137,121.02 and 31,439.88

Step by Step Solution

1. Step 1: Write the proportion equation
   91,411.98 : 137,121.02 = 31,439.88 : x
2. Step 2: Convert to fraction form
   91,411.98/137,121.02 = 31,439.88/x
3. Step 3: Cross multiply
   91,411.98x = 137,121.02 × 31,439.88
4. Step 4: Simplify right side
   91,411.98x = 4,311,068,374.98
5. Step 5: Solve for x
   x = 4,311,068,374.98/91,411.98
6. Step 6: Final answer
   x = 47,160.87