Finding the Fourth Proportional to 21,056.86, 31,585.32 and 5,474.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,056.86 : 31,585.32 = 5,474.50 : x
2. Step 2: Convert to fraction form
   21,056.86/31,585.32 = 5,474.50/x
3. Step 3: Cross multiply
   21,056.86x = 31,585.32 × 5,474.50
4. Step 4: Simplify right side
   21,056.86x = 172,913,834.34
5. Step 5: Solve for x
   x = 172,913,834.34/21,056.86
6. Step 6: Final answer
   x = 8,211.76