Finding the Fourth Proportional to 9,905.86, 13,670.01 and 5,429.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.86 : 13,670.01 = 5,429.53 : x
2. Step 2: Convert to fraction form
   9,905.86/13,670.01 = 5,429.53/x
3. Step 3: Cross multiply
   9,905.86x = 13,670.01 × 5,429.53
4. Step 4: Simplify right side
   9,905.86x = 74,221,729.40
5. Step 5: Solve for x
   x = 74,221,729.40/9,905.86
6. Step 6: Final answer
   x = 7,492.71