Finding the Fourth Proportional to 218,819.98, 328,098.52 and 85,541.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,819.98 : 328,098.52 = 85,541.50 : x
2. Step 2: Convert to fraction form
   218,819.98/328,098.52 = 85,541.50/x
3. Step 3: Cross multiply
   218,819.98x = 328,098.52 × 85,541.50
4. Step 4: Simplify right side
   218,819.98x = 28,066,039,548.58
5. Step 5: Solve for x
   x = 28,066,039,548.58/218,819.98
6. Step 6: Final answer
   x = 128,260.86