Finding the Fourth Proportional to 31,272.32, 47,128.19 and 28,155.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,272.32 : 47,128.19 = 28,155.86 : x
2. Step 2: Convert to fraction form
   31,272.32/47,128.19 = 28,155.86/x
3. Step 3: Cross multiply
   31,272.32x = 47,128.19 × 28,155.86
4. Step 4: Simplify right side
   31,272.32x = 1,326,934,719.69
5. Step 5: Solve for x
   x = 1,326,934,719.69/31,272.32
6. Step 6: Final answer
   x = 42,431.60