Finding the Fourth Proportional to 99,981.63, 137,974.73 and 54,658.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99,981.63 : 137,974.73 = 54,658.89 : x
2. Step 2: Convert to fraction form
   99,981.63/137,974.73 = 54,658.89/x
3. Step 3: Cross multiply
   99,981.63x = 137,974.73 × 54,658.89
4. Step 4: Simplify right side
   99,981.63x = 7,541,545,316.56
5. Step 5: Solve for x
   x = 7,541,545,316.56/99,981.63
6. Step 6: Final answer
   x = 75,429.31