Finding the Fourth Proportional to 11,875.30, 16,389.61 and 7,400.45

Step by Step Solution

1. Step 1: Write the proportion equation
   11,875.30 : 16,389.61 = 7,400.45 : x
2. Step 2: Convert to fraction form
   11,875.30/16,389.61 = 7,400.45/x
3. Step 3: Cross multiply
   11,875.30x = 16,389.61 × 7,400.45
4. Step 4: Simplify right side
   11,875.30x = 121,290,511.80
5. Step 5: Solve for x
   x = 121,290,511.80/11,875.30
6. Step 6: Final answer
   x = 10,213.68