Finding the Fourth Proportional to 31,419.86, 47,119.80 and 10,355.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,419.86 : 47,119.80 = 10,355.98 : x
2. Step 2: Convert to fraction form
   31,419.86/47,119.80 = 10,355.98/x
3. Step 3: Cross multiply
   31,419.86x = 47,119.80 × 10,355.98
4. Step 4: Simplify right side
   31,419.86x = 487,971,470.81
5. Step 5: Solve for x
   x = 487,971,470.81/31,419.86
6. Step 6: Final answer
   x = 15,530.67