Finding the Fourth Proportional to 11,875.74, 17,814.54 and 3,978.29

Step by Step Solution

1. Step 1: Write the proportion equation
   11,875.74 : 17,814.54 = 3,978.29 : x
2. Step 2: Convert to fraction form
   11,875.74/17,814.54 = 3,978.29/x
3. Step 3: Cross multiply
   11,875.74x = 17,814.54 × 3,978.29
4. Step 4: Simplify right side
   11,875.74x = 70,871,317.26
5. Step 5: Solve for x
   x = 70,871,317.26/11,875.74
6. Step 6: Final answer
   x = 5,967.74