Finding the Fourth Proportional to 13,071.78, 18,037.62 and 7,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.78 : 18,037.62 = 7,406.10 : x
2. Step 2: Convert to fraction form
   13,071.78/18,037.62 = 7,406.10/x
3. Step 3: Cross multiply
   13,071.78x = 18,037.62 × 7,406.10
4. Step 4: Simplify right side
   13,071.78x = 133,588,417.48
5. Step 5: Solve for x
   x = 133,588,417.48/13,071.78
6. Step 6: Final answer
   x = 10,219.60