Finding the Fourth Proportional to 109,691.55, 164,216.57 and 99,185.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109,691.55 : 164,216.57 = 99,185.72 : x
2. Step 2: Convert to fraction form
   109,691.55/164,216.57 = 99,185.72/x
3. Step 3: Cross multiply
   109,691.55x = 164,216.57 × 99,185.72
4. Step 4: Simplify right side
   109,691.55x = 16,287,937,414.37
5. Step 5: Solve for x
   x = 16,287,937,414.37/109,691.55
6. Step 6: Final answer
   x = 148,488.53