Finding the Fourth Proportional to 99,663.48, 137,451 and 84,216.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,663.48 : 137,451 = 84,216.78 : x
2. Step 2: Convert to fraction form
   99,663.48/137,451 = 84,216.78/x
3. Step 3: Cross multiply
   99,663.48x = 137,451 × 84,216.78
4. Step 4: Simplify right side
   99,663.48x = 11,575,680,627.78
5. Step 5: Solve for x
   x = 11,575,680,627.78/99,663.48
6. Step 6: Final answer
   x = 116,147.67