Finding the Fourth Proportional to 99,189.72, 136,881.24 and 53,867.28

Step by Step Solution

1. Step 1: Write the proportion equation
   99,189.72 : 136,881.24 = 53,867.28 : x
2. Step 2: Convert to fraction form
   99,189.72/136,881.24 = 53,867.28/x
3. Step 3: Cross multiply
   99,189.72x = 136,881.24 × 53,867.28
4. Step 4: Simplify right side
   99,189.72x = 7,373,420,081.83
5. Step 5: Solve for x
   x = 7,373,420,081.83/99,189.72
6. Step 6: Final answer
   x = 74,336.53