Finding the Fourth Proportional to 9,905.98, 13,670.74 and 5,429.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.98 : 13,670.74 = 5,429.92 : x
2. Step 2: Convert to fraction form
   9,905.98/13,670.74 = 5,429.92/x
3. Step 3: Cross multiply
   9,905.98x = 13,670.74 × 5,429.92
4. Step 4: Simplify right side
   9,905.98x = 74,231,024.54
5. Step 5: Solve for x
   x = 74,231,024.54/9,905.98
6. Step 6: Final answer
   x = 7,493.56