Finding the Fourth Proportional to 13,757.31, 18,985.59 and 7,788.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,757.31 : 18,985.59 = 7,788.87 : x
2. Step 2: Convert to fraction form
   13,757.31/18,985.59 = 7,788.87/x
3. Step 3: Cross multiply
   13,757.31x = 18,985.59 × 7,788.87
4. Step 4: Simplify right side
   13,757.31x = 147,876,292.38
5. Step 5: Solve for x
   x = 147,876,292.38/13,757.31
6. Step 6: Final answer
   x = 10,748.92