Finding the Fourth Proportional to 7,916.83, 11,878.43 and 2,987.86

Step by Step Solution

1. Step 1: Write the proportion equation
   7,916.83 : 11,878.43 = 2,987.86 : x
2. Step 2: Convert to fraction form
   7,916.83/11,878.43 = 2,987.86/x
3. Step 3: Cross multiply
   7,916.83x = 11,878.43 × 2,987.86
4. Step 4: Simplify right side
   7,916.83x = 35,491,085.86
5. Step 5: Solve for x
   x = 35,491,085.86/7,916.83
6. Step 6: Final answer
   x = 4,482.99