Finding the Fourth Proportional to 7,143.06, 10,781.34 and 7,143.06

Step by Step Solution

1. Step 1: Write the proportion equation
   7,143.06 : 10,781.34 = 7,143.06 : x
2. Step 2: Convert to fraction form
   7,143.06/10,781.34 = 7,143.06/x
3. Step 3: Cross multiply
   7,143.06x = 10,781.34 × 7,143.06
4. Step 4: Simplify right side
   7,143.06x = 77,011,758.50
5. Step 5: Solve for x
   x = 77,011,758.50/7,143.06
6. Step 6: Final answer
   x = 10,781.34