Finding the Fourth Proportional to 12,926.55, 17,840.32 and 7,889.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,926.55 : 17,840.32 = 7,889.72 : x
2. Step 2: Convert to fraction form
   12,926.55/17,840.32 = 7,889.72/x
3. Step 3: Cross multiply
   12,926.55x = 17,840.32 × 7,889.72
4. Step 4: Simplify right side
   12,926.55x = 140,755,154.39
5. Step 5: Solve for x
   x = 140,755,154.39/12,926.55
6. Step 6: Final answer
   x = 10,888.84