Finding the Fourth Proportional to 8,916.15, 12,300.40 and 5,377.39

Step by Step Solution

1. Step 1: Write the proportion equation
   8,916.15 : 12,300.40 = 5,377.39 : x
2. Step 2: Convert to fraction form
   8,916.15/12,300.40 = 5,377.39/x
3. Step 3: Cross multiply
   8,916.15x = 12,300.40 × 5,377.39
4. Step 4: Simplify right side
   8,916.15x = 66,144,047.96
5. Step 5: Solve for x
   x = 66,144,047.96/8,916.15
6. Step 6: Final answer
   x = 7,418.45