Finding the Fourth Proportional to 13,156.86, 18,156.45 and 7,491.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,156.86 : 18,156.45 = 7,491.31 : x
2. Step 2: Convert to fraction form
   13,156.86/18,156.45 = 7,491.31/x
3. Step 3: Cross multiply
   13,156.86x = 18,156.45 × 7,491.31
4. Step 4: Simplify right side
   13,156.86x = 136,015,595.45
5. Step 5: Solve for x
   x = 136,015,595.45/13,156.86
6. Step 6: Final answer
   x = 10,338.00