Finding the Fourth Proportional to 13,857.61, 19,123.50 and 7,484.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,857.61 : 19,123.50 = 7,484.20 : x
2. Step 2: Convert to fraction form
   13,857.61/19,123.50 = 7,484.20/x
3. Step 3: Cross multiply
   13,857.61x = 19,123.50 × 7,484.20
4. Step 4: Simplify right side
   13,857.61x = 143,124,094.54
5. Step 5: Solve for x
   x = 143,124,094.54/13,857.61
6. Step 6: Final answer
   x = 10,328.20