Finding the Fourth Proportional to 99,931.27, 137,888.78 and 59,089.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,931.27 : 137,888.78 = 59,089.72 : x
2. Step 2: Convert to fraction form
   99,931.27/137,888.78 = 59,089.72/x
3. Step 3: Cross multiply
   99,931.27x = 137,888.78 × 59,089.72
4. Step 4: Simplify right side
   99,931.27x = 8,147,809,549.07
5. Step 5: Solve for x
   x = 8,147,809,549.07/99,931.27
6. Step 6: Final answer
   x = 81,534.13