Finding the Fourth Proportional to 99,531.04, 137,370.72 and 57,103.60

Step by Step Solution

1. Step 1: Write the proportion equation
   99,531.04 : 137,370.72 = 57,103.60 : x
2. Step 2: Convert to fraction form
   99,531.04/137,370.72 = 57,103.60/x
3. Step 3: Cross multiply
   99,531.04x = 137,370.72 × 57,103.60
4. Step 4: Simplify right side
   99,531.04x = 7,844,362,646.59
5. Step 5: Solve for x
   x = 7,844,362,646.59/99,531.04
6. Step 6: Final answer
   x = 78,813.23