Finding the Fourth Proportional to 81,730.93, 112,839 and 64,803.55

Step by Step Solution

1. Step 1: Write the proportion equation
   81,730.93 : 112,839 = 64,803.55 : x
2. Step 2: Convert to fraction form
   81,730.93/112,839 = 64,803.55/x
3. Step 3: Cross multiply
   81,730.93x = 112,839 × 64,803.55
4. Step 4: Simplify right side
   81,730.93x = 7,312,367,778.45
5. Step 5: Solve for x
   x = 7,312,367,778.45/81,730.93
6. Step 6: Final answer
   x = 89,468.79