Finding the Fourth Proportional to 12,384.78, 18,572.31 and 4,987.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,384.78 : 18,572.31 = 4,987.86 : x
2. Step 2: Convert to fraction form
   12,384.78/18,572.31 = 4,987.86/x
3. Step 3: Cross multiply
   12,384.78x = 18,572.31 × 4,987.86
4. Step 4: Simplify right side
   12,384.78x = 92,636,082.16
5. Step 5: Solve for x
   x = 92,636,082.16/12,384.78
6. Step 6: Final answer
   x = 7,479.83