Finding the Fourth Proportional to 12,570.93, 17,347.89 and 7,855.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,570.93 : 17,347.89 = 7,855.17 : x
2. Step 2: Convert to fraction form
   12,570.93/17,347.89 = 7,855.17/x
3. Step 3: Cross multiply
   12,570.93x = 17,347.89 × 7,855.17
4. Step 4: Simplify right side
   12,570.93x = 136,270,625.09
5. Step 5: Solve for x
   x = 136,270,625.09/12,570.93
6. Step 6: Final answer
   x = 10,840.14