Finding the Fourth Proportional to 278,932.52, 418,389.06 and 89,390.09

Step by Step Solution

1. Step 1: Write the proportion equation
   278,932.52 : 418,389.06 = 89,390.09 : x
2. Step 2: Convert to fraction form
   278,932.52/418,389.06 = 89,390.09/x
3. Step 3: Cross multiply
   278,932.52x = 418,389.06 × 89,390.09
4. Step 4: Simplify right side
   278,932.52x = 37,399,835,728.42
5. Step 5: Solve for x
   x = 37,399,835,728.42/278,932.52
6. Step 6: Final answer
   x = 134,082.02