Finding the Fourth Proportional to 13,077.88, 18,046.72 and 7,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,077.88 : 18,046.72 = 7,109.50 : x
2. Step 2: Convert to fraction form
   13,077.88/18,046.72 = 7,109.50/x
3. Step 3: Cross multiply
   13,077.88x = 18,046.72 × 7,109.50
4. Step 4: Simplify right side
   13,077.88x = 128,303,155.84
5. Step 5: Solve for x
   x = 128,303,155.84/13,077.88
6. Step 6: Final answer
   x = 9,810.70