Finding the Fourth Proportional to 12,988.95, 17,922.47 and 7,681.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,988.95 : 17,922.47 = 7,681.83 : x
2. Step 2: Convert to fraction form
   12,988.95/17,922.47 = 7,681.83/x
3. Step 3: Cross multiply
   12,988.95x = 17,922.47 × 7,681.83
4. Step 4: Simplify right side
   12,988.95x = 137,677,367.72
5. Step 5: Solve for x
   x = 137,677,367.72/12,988.95
6. Step 6: Final answer
   x = 10,599.58