Finding the Fourth Proportional to 99,858.72, 137,805.84 and 55,146.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,858.72 : 137,805.84 = 55,146.72 : x
2. Step 2: Convert to fraction form
   99,858.72/137,805.84 = 55,146.72/x
3. Step 3: Cross multiply
   99,858.72x = 137,805.84 × 55,146.72
4. Step 4: Simplify right side
   99,858.72x = 7,599,540,072.84
5. Step 5: Solve for x
   x = 7,599,540,072.84/99,858.72
6. Step 6: Final answer
   x = 76,102.92