Finding the Fourth Proportional to 21,002.42, 31,502.59 and 7,853.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.42 : 31,502.59 = 7,853.83 : x
2. Step 2: Convert to fraction form
   21,002.42/31,502.59 = 7,853.83/x
3. Step 3: Cross multiply
   21,002.42x = 31,502.59 × 7,853.83
4. Step 4: Simplify right side
   21,002.42x = 247,415,888.03
5. Step 5: Solve for x
   x = 247,415,888.03/21,002.42
6. Step 6: Final answer
   x = 11,780.35