Finding the Fourth Proportional to 55,531, 83,290.38 and 13,978

Step by Step Solution

1. Step 1: Write the proportion equation
   55,531 : 83,290.38 = 13,978 : x
2. Step 2: Convert to fraction form
   55,531/83,290.38 = 13,978/x
3. Step 3: Cross multiply
   55,531x = 83,290.38 × 13,978
4. Step 4: Simplify right side
   55,531x = 1,164,232,931.64
5. Step 5: Solve for x
   x = 1,164,232,931.64/55,531
6. Step 6: Final answer
   x = 20,965.46