Finding the Fourth Proportional to 2,527.86, 3,790.62 and 987.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,527.86 : 3,790.62 = 987.78 : x
2. Step 2: Convert to fraction form
   2,527.86/3,790.62 = 987.78/x
3. Step 3: Cross multiply
   2,527.86x = 3,790.62 × 987.78
4. Step 4: Simplify right side
   2,527.86x = 3,744,298.62
5. Step 5: Solve for x
   x = 3,744,298.62/2,527.86
6. Step 6: Final answer
   x = 1,481.21