Finding the Fourth Proportional to 5,916.12, 8,858.39 and 5,215.47

Step by Step Solution

1. Step 1: Write the proportion equation
   5,916.12 : 8,858.39 = 5,215.47 : x
2. Step 2: Convert to fraction form
   5,916.12/8,858.39 = 5,215.47/x
3. Step 3: Cross multiply
   5,916.12x = 8,858.39 × 5,215.47
4. Step 4: Simplify right side
   5,916.12x = 46,200,641.22
5. Step 5: Solve for x
   x = 46,200,641.22/5,916.12
6. Step 6: Final answer
   x = 7,809.28