Finding the Fourth Proportional to 9,139.21, 12,611.76 and 5,106.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.21 : 12,611.76 = 5,106.25 : x
2. Step 2: Convert to fraction form
   9,139.21/12,611.76 = 5,106.25/x
3. Step 3: Cross multiply
   9,139.21x = 12,611.76 × 5,106.25
4. Step 4: Simplify right side
   9,139.21x = 64,398,799.50
5. Step 5: Solve for x
   x = 64,398,799.50/9,139.21
6. Step 6: Final answer
   x = 7,046.43