Finding the Fourth Proportional to 30,521.61, 42,117.78 and 16,908.74

Step by Step Solution

1. Step 1: Write the proportion equation
   30,521.61 : 42,117.78 = 16,908.74 : x
2. Step 2: Convert to fraction form
   30,521.61/42,117.78 = 16,908.74/x
3. Step 3: Cross multiply
   30,521.61x = 42,117.78 × 16,908.74
4. Step 4: Simplify right side
   30,521.61x = 712,158,380.81
5. Step 5: Solve for x
   x = 712,158,380.81/30,521.61
6. Step 6: Final answer
   x = 23,332.92