Finding the Fourth Proportional to 99,260.36, 136,978.72 and 53,938.16

Step by Step Solution

1. Step 1: Write the proportion equation
   99,260.36 : 136,978.72 = 53,938.16 : x
2. Step 2: Convert to fraction form
   99,260.36/136,978.72 = 53,938.16/x
3. Step 3: Cross multiply
   99,260.36x = 136,978.72 × 53,938.16
4. Step 4: Simplify right side
   99,260.36x = 7,388,379,296.22
5. Step 5: Solve for x
   x = 7,388,379,296.22/99,260.36
6. Step 6: Final answer
   x = 74,434.34