Finding the Fourth Proportional to 12,931.89, 19,406.33 and 7,092.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.89 : 19,406.33 = 7,092.60 : x
2. Step 2: Convert to fraction form
   12,931.89/19,406.33 = 7,092.60/x
3. Step 3: Cross multiply
   12,931.89x = 19,406.33 × 7,092.60
4. Step 4: Simplify right side
   12,931.89x = 137,641,336.16
5. Step 5: Solve for x
   x = 137,641,336.16/12,931.89
6. Step 6: Final answer
   x = 10,643.56