Finding the Fourth Proportional to 13,388.91, 18,476.73 and 7,420.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.91 : 18,476.73 = 7,420.83 : x
2. Step 2: Convert to fraction form
   13,388.91/18,476.73 = 7,420.83/x
3. Step 3: Cross multiply
   13,388.91x = 18,476.73 × 7,420.83
4. Step 4: Simplify right side
   13,388.91x = 137,112,672.29
5. Step 5: Solve for x
   x = 137,112,672.29/13,388.91
6. Step 6: Final answer
   x = 10,240.76