Finding the Fourth Proportional to 218,856.31, 328,056.84 and 92,391.01

Step by Step Solution

1. Step 1: Write the proportion equation
   218,856.31 : 328,056.84 = 92,391.01 : x
2. Step 2: Convert to fraction form
   218,856.31/328,056.84 = 92,391.01/x
3. Step 3: Cross multiply
   218,856.31x = 328,056.84 × 92,391.01
4. Step 4: Simplify right side
   218,856.31x = 30,309,501,144.72
5. Step 5: Solve for x
   x = 30,309,501,144.72/218,856.31
6. Step 6: Final answer
   x = 138,490.42