Finding the Fourth Proportional to 219,494.20, 329,090.00 and 86,389.74

Step by Step Solution

1. Step 1: Write the proportion equation
   219,494.20 : 329,090.00 = 86,389.74 : x
2. Step 2: Convert to fraction form
   219,494.20/329,090.00 = 86,389.74/x
3. Step 3: Cross multiply
   219,494.20x = 329,090.00 × 86,389.74
4. Step 4: Simplify right side
   219,494.20x = 28,429,997,459.20
5. Step 5: Solve for x
   x = 28,429,997,459.20/219,494.20
6. Step 6: Final answer
   x = 129,525.05