Finding the Fourth Proportional to 13,156.02, 18,155.75 and 7,187.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,156.02 : 18,155.75 = 7,187.94 : x
2. Step 2: Convert to fraction form
   13,156.02/18,155.75 = 7,187.94/x
3. Step 3: Cross multiply
   13,156.02x = 18,155.75 × 7,187.94
4. Step 4: Simplify right side
   13,156.02x = 130,502,405.72
5. Step 5: Solve for x
   x = 130,502,405.72/13,156.02
6. Step 6: Final answer
   x = 9,919.60