Finding the Fourth Proportional to 12,368.90, 17,066.50 and 7,889.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,368.90 : 17,066.50 = 7,889.81 : x
2. Step 2: Convert to fraction form
   12,368.90/17,066.50 = 7,889.81/x
3. Step 3: Cross multiply
   12,368.90x = 17,066.50 × 7,889.81
4. Step 4: Simplify right side
   12,368.90x = 134,651,337.31
5. Step 5: Solve for x
   x = 134,651,337.31/12,368.90
6. Step 6: Final answer
   x = 10,886.28