Finding the Fourth Proportional to 12,970.55, 17,898.63 and 7,665.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,970.55 : 17,898.63 = 7,665.86 : x
2. Step 2: Convert to fraction form
   12,970.55/17,898.63 = 7,665.86/x
3. Step 3: Cross multiply
   12,970.55x = 17,898.63 × 7,665.86
4. Step 4: Simplify right side
   12,970.55x = 137,208,391.77
5. Step 5: Solve for x
   x = 137,208,391.77/12,970.55
6. Step 6: Final answer
   x = 10,578.46