Finding the Fourth Proportional to 85,181.22, 117,490.50 and 72,345.96

Step by Step Solution

1. Step 1: Write the proportion equation
   85,181.22 : 117,490.50 = 72,345.96 : x
2. Step 2: Convert to fraction form
   85,181.22/117,490.50 = 72,345.96/x
3. Step 3: Cross multiply
   85,181.22x = 117,490.50 × 72,345.96
4. Step 4: Simplify right side
   85,181.22x = 8,499,963,013.38
5. Step 5: Solve for x
   x = 8,499,963,013.38/85,181.22
6. Step 6: Final answer
   x = 99,786.82