Finding the Fourth Proportional to 9,905.74, 13,670.02 and 5,429.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.74 : 13,670.02 = 5,429.39 : x
2. Step 2: Convert to fraction form
   9,905.74/13,670.02 = 5,429.39/x
3. Step 3: Cross multiply
   9,905.74x = 13,670.02 × 5,429.39
4. Step 4: Simplify right side
   9,905.74x = 74,219,869.89
5. Step 5: Solve for x
   x = 74,219,869.89/9,905.74
6. Step 6: Final answer
   x = 7,492.61