Finding the Fourth Proportional to 16,601.08, 22,931.86 and 15,420.10

Step by Step Solution

1. Step 1: Write the proportion equation
   16,601.08 : 22,931.86 = 15,420.10 : x
2. Step 2: Convert to fraction form
   16,601.08/22,931.86 = 15,420.10/x
3. Step 3: Cross multiply
   16,601.08x = 22,931.86 × 15,420.10
4. Step 4: Simplify right side
   16,601.08x = 353,611,574.39
5. Step 5: Solve for x
   x = 353,611,574.39/16,601.08
6. Step 6: Final answer
   x = 21,300.52