Finding the Fourth Proportional to 13,151.35, 18,145.88 and 7,845.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,151.35 : 18,145.88 = 7,845.13 : x
2. Step 2: Convert to fraction form
   13,151.35/18,145.88 = 7,845.13/x
3. Step 3: Cross multiply
   13,151.35x = 18,145.88 × 7,845.13
4. Step 4: Simplify right side
   13,151.35x = 142,356,696.84
5. Step 5: Solve for x
   x = 142,356,696.84/13,151.35
6. Step 6: Final answer
   x = 10,824.50