Finding the Fourth Proportional to 13,077.90, 18,047.71 and 7,109.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,077.90 : 18,047.71 = 7,109.59 : x
2. Step 2: Convert to fraction form
   13,077.90/18,047.71 = 7,109.59/x
3. Step 3: Cross multiply
   13,077.90x = 18,047.71 × 7,109.59
4. Step 4: Simplify right side
   13,077.90x = 128,311,818.54
5. Step 5: Solve for x
   x = 128,311,818.54/13,077.90
6. Step 6: Final answer
   x = 9,811.35