Finding the Fourth Proportional to 13,156.77, 18,156.78 and 7,850.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,156.77 : 18,156.78 = 7,850.87 : x
2. Step 2: Convert to fraction form
   13,156.77/18,156.78 = 7,850.87/x
3. Step 3: Cross multiply
   13,156.77x = 18,156.78 × 7,850.87
4. Step 4: Simplify right side
   13,156.77x = 142,546,428.61
5. Step 5: Solve for x
   x = 142,546,428.61/13,156.77
6. Step 6: Final answer
   x = 10,834.45