Finding the Fourth Proportional to 39,900.15, 55,061.28 and 21,994.76

Step by Step Solution

1. Step 1: Write the proportion equation
   39,900.15 : 55,061.28 = 21,994.76 : x
2. Step 2: Convert to fraction form
   39,900.15/55,061.28 = 21,994.76/x
3. Step 3: Cross multiply
   39,900.15x = 55,061.28 × 21,994.76
4. Step 4: Simplify right side
   39,900.15x = 1,211,059,638.89
5. Step 5: Solve for x
   x = 1,211,059,638.89/39,900.15
6. Step 6: Final answer
   x = 30,352.26