Finding the Fourth Proportional to 3,607.59, 4,978.54 and 2,116.58

Step by Step Solution

1. Step 1: Write the proportion equation
   3,607.59 : 4,978.54 = 2,116.58 : x
2. Step 2: Convert to fraction form
   3,607.59/4,978.54 = 2,116.58/x
3. Step 3: Cross multiply
   3,607.59x = 4,978.54 × 2,116.58
4. Step 4: Simplify right side
   3,607.59x = 10,537,467.61
5. Step 5: Solve for x
   x = 10,537,467.61/3,607.59
6. Step 6: Final answer
   x = 2,920.92