Finding the Fourth Proportional to 78,326.83, 117,451.68 and 28,399.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,326.83 : 117,451.68 = 28,399.47 : x
2. Step 2: Convert to fraction form
   78,326.83/117,451.68 = 28,399.47/x
3. Step 3: Cross multiply
   78,326.83x = 117,451.68 × 28,399.47
4. Step 4: Simplify right side
   78,326.83x = 3,335,565,462.61
5. Step 5: Solve for x
   x = 3,335,565,462.61/78,326.83
6. Step 6: Final answer
   x = 42,585.22