Finding the Fourth Proportional to 55,421.10, 83,143.34 and 17,978.26

Step by Step Solution

1. Step 1: Write the proportion equation
   55,421.10 : 83,143.34 = 17,978.26 : x
2. Step 2: Convert to fraction form
   55,421.10/83,143.34 = 17,978.26/x
3. Step 3: Cross multiply
   55,421.10x = 83,143.34 × 17,978.26
4. Step 4: Simplify right side
   55,421.10x = 1,494,772,583.79
5. Step 5: Solve for x
   x = 1,494,772,583.79/55,421.10
6. Step 6: Final answer
   x = 26,971.18