Finding the Fourth Proportional to 12,387.47, 18,581.82 and 4,990.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,387.47 : 18,581.82 = 4,990.93 : x
2. Step 2: Convert to fraction form
   12,387.47/18,581.82 = 4,990.93/x
3. Step 3: Cross multiply
   12,387.47x = 18,581.82 × 4,990.93
4. Step 4: Simplify right side
   12,387.47x = 92,740,562.89
5. Step 5: Solve for x
   x = 92,740,562.89/12,387.47
6. Step 6: Final answer
   x = 7,486.64