Finding the Fourth Proportional to 99,897.72, 137,858.85 and 55,185.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,897.72 : 137,858.85 = 55,185.72 : x
2. Step 2: Convert to fraction form
   99,897.72/137,858.85 = 55,185.72/x
3. Step 3: Cross multiply
   99,897.72x = 137,858.85 × 55,185.72
4. Step 4: Simplify right side
   99,897.72x = 7,607,840,033.59
5. Step 5: Solve for x
   x = 7,607,840,033.59/99,897.72
6. Step 6: Final answer
   x = 76,156.29