Finding the Fourth Proportional to 219,300.72, 328,950.24 and 86,087.76

Step by Step Solution

1. Step 1: Write the proportion equation
   219,300.72 : 328,950.24 = 86,087.76 : x
2. Step 2: Convert to fraction form
   219,300.72/328,950.24 = 86,087.76/x
3. Step 3: Cross multiply
   219,300.72x = 328,950.24 × 86,087.76
4. Step 4: Simplify right side
   219,300.72x = 28,318,589,313.06
5. Step 5: Solve for x
   x = 28,318,589,313.06/219,300.72
6. Step 6: Final answer
   x = 129,131.31