Finding the Fourth Proportional to 39,883.86, 55,037.12 and 21,978.86

Step by Step Solution

1. Step 1: Write the proportion equation
   39,883.86 : 55,037.12 = 21,978.86 : x
2. Step 2: Convert to fraction form
   39,883.86/55,037.12 = 21,978.86/x
3. Step 3: Cross multiply
   39,883.86x = 55,037.12 × 21,978.86
4. Step 4: Simplify right side
   39,883.86x = 1,209,653,347.82
5. Step 5: Solve for x
   x = 1,209,653,347.82/39,883.86
6. Step 6: Final answer
   x = 30,329.40