Finding the Fourth Proportional to 34,439.48, 47,517.72 and 21,009.86

Step by Step Solution

1. Step 1: Write the proportion equation
   34,439.48 : 47,517.72 = 21,009.86 : x
2. Step 2: Convert to fraction form
   34,439.48/47,517.72 = 21,009.86/x
3. Step 3: Cross multiply
   34,439.48x = 47,517.72 × 21,009.86
4. Step 4: Simplify right side
   34,439.48x = 998,340,644.72
5. Step 5: Solve for x
   x = 998,340,644.72/34,439.48
6. Step 6: Final answer
   x = 28,988.26