Finding the Fourth Proportional to 42,479.76, 63,659.28 and 31,298.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,479.76 : 63,659.28 = 31,298.40 : x
2. Step 2: Convert to fraction form
   42,479.76/63,659.28 = 31,298.40/x
3. Step 3: Cross multiply
   42,479.76x = 63,659.28 × 31,298.40
4. Step 4: Simplify right side
   42,479.76x = 1,992,433,609.15
5. Step 5: Solve for x
   x = 1,992,433,609.15/42,479.76
6. Step 6: Final answer
   x = 46,903.13