Finding the Fourth Proportional to 315,008.64, 472,448.52 and 90,308.88

Step by Step Solution

1. Step 1: Write the proportion equation
   315,008.64 : 472,448.52 = 90,308.88 : x
2. Step 2: Convert to fraction form
   315,008.64/472,448.52 = 90,308.88/x
3. Step 3: Cross multiply
   315,008.64x = 472,448.52 × 90,308.88
4. Step 4: Simplify right side
   315,008.64x = 42,666,296,698.86
5. Step 5: Solve for x
   x = 42,666,296,698.86/315,008.64
6. Step 6: Final answer
   x = 135,444.85