Finding the Fourth Proportional to 61,003.62, 91,513.98 and 18,887.31

Step by Step Solution

1. Step 1: Write the proportion equation
   61,003.62 : 91,513.98 = 18,887.31 : x
2. Step 2: Convert to fraction form
   61,003.62/91,513.98 = 18,887.31/x
3. Step 3: Cross multiply
   61,003.62x = 91,513.98 × 18,887.31
4. Step 4: Simplify right side
   61,003.62x = 1,728,452,909.59
5. Step 5: Solve for x
   x = 1,728,452,909.59/61,003.62
6. Step 6: Final answer
   x = 28,333.61