Finding the Fourth Proportional to 99,801.76, 137,721.36 and 55,081.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99,801.76 : 137,721.36 = 55,081.12 : x
2. Step 2: Convert to fraction form
   99,801.76/137,721.36 = 55,081.12/x
3. Step 3: Cross multiply
   99,801.76x = 137,721.36 × 55,081.12
4. Step 4: Simplify right side
   99,801.76x = 7,585,846,756.72
5. Step 5: Solve for x
   x = 7,585,846,756.72/99,801.76
6. Step 6: Final answer
   x = 76,009.15