Finding the Fourth Proportional to 9,921.74, 13,693.28 and 5,671.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,921.74 : 13,693.28 = 5,671.98 : x
2. Step 2: Convert to fraction form
   9,921.74/13,693.28 = 5,671.98/x
3. Step 3: Cross multiply
   9,921.74x = 13,693.28 × 5,671.98
4. Step 4: Simplify right side
   9,921.74x = 77,667,981.93
5. Step 5: Solve for x
   x = 77,667,981.93/9,921.74
6. Step 6: Final answer
   x = 7,828.06