Finding the Fourth Proportional to 12,377.64, 18,564.15 and 3,490.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,377.64 : 18,564.15 = 3,490.78 : x
2. Step 2: Convert to fraction form
   12,377.64/18,564.15 = 3,490.78/x
3. Step 3: Cross multiply
   12,377.64x = 18,564.15 × 3,490.78
4. Step 4: Simplify right side
   12,377.64x = 64,803,335.57
5. Step 5: Solve for x
   x = 64,803,335.57/12,377.64
6. Step 6: Final answer
   x = 5,235.52