Finding the Fourth Proportional to 13,890.19, 19,168.59 and 7,602.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,890.19 : 19,168.59 = 7,602.70 : x
2. Step 2: Convert to fraction form
   13,890.19/19,168.59 = 7,602.70/x
3. Step 3: Cross multiply
   13,890.19x = 19,168.59 × 7,602.70
4. Step 4: Simplify right side
   13,890.19x = 145,733,019.78
5. Step 5: Solve for x
   x = 145,733,019.78/13,890.19
6. Step 6: Final answer
   x = 10,491.80