Finding the Fourth Proportional to 8,835.90, 13,214.94 and 5,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,835.90 : 13,214.94 = 5,128.56 : x
2. Step 2: Convert to fraction form
   8,835.90/13,214.94 = 5,128.56/x
3. Step 3: Cross multiply
   8,835.90x = 13,214.94 × 5,128.56
4. Step 4: Simplify right side
   8,835.90x = 67,773,612.69
5. Step 5: Solve for x
   x = 67,773,612.69/8,835.90
6. Step 6: Final answer
   x = 7,670.26