Finding the Fourth Proportional to 99,759.47, 137,663.78 and 54,436.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,759.47 : 137,663.78 = 54,436.32 : x
2. Step 2: Convert to fraction form
   99,759.47/137,663.78 = 54,436.32/x
3. Step 3: Cross multiply
   99,759.47x = 137,663.78 × 54,436.32
4. Step 4: Simplify right side
   99,759.47x = 7,493,909,308.31
5. Step 5: Solve for x
   x = 7,493,909,308.31/99,759.47
6. Step 6: Final answer
   x = 75,119.78