Finding the Fourth Proportional to 99,710.94, 137,601.53 and 54,389.91

Step by Step Solution

1. Step 1: Write the proportion equation
   99,710.94 : 137,601.53 = 54,389.91 : x
2. Step 2: Convert to fraction form
   99,710.94/137,601.53 = 54,389.91/x
3. Step 3: Cross multiply
   99,710.94x = 137,601.53 × 54,389.91
4. Step 4: Simplify right side
   99,710.94x = 7,484,134,560.61
5. Step 5: Solve for x
   x = 7,484,134,560.61/99,710.94
6. Step 6: Final answer
   x = 75,058.31