Finding the Fourth Proportional to 278,693.16, 418,150.50 and 89,182.72

Step by Step Solution

1. Step 1: Write the proportion equation
   278,693.16 : 418,150.50 = 89,182.72 : x
2. Step 2: Convert to fraction form
   278,693.16/418,150.50 = 89,182.72/x
3. Step 3: Cross multiply
   278,693.16x = 418,150.50 × 89,182.72
4. Step 4: Simplify right side
   278,693.16x = 37,291,798,959.36
5. Step 5: Solve for x
   x = 37,291,798,959.36/278,693.16
6. Step 6: Final answer
   x = 133,809.52