Finding the Fourth Proportional to 109,518.30, 164,047.05 and 91,086.30

Step by Step Solution

1. Step 1: Write the proportion equation
   109,518.30 : 164,047.05 = 91,086.30 : x
2. Step 2: Convert to fraction form
   109,518.30/164,047.05 = 91,086.30/x
3. Step 3: Cross multiply
   109,518.30x = 164,047.05 × 91,086.30
4. Step 4: Simplify right side
   109,518.30x = 14,942,438,810.42
5. Step 5: Solve for x
   x = 14,942,438,810.42/109,518.30
6. Step 6: Final answer
   x = 136,437.83