Finding the Fourth Proportional to 5,407.89, 7,418.91 and 5,356.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,407.89 : 7,418.91 = 5,356.86 : x
2. Step 2: Convert to fraction form
   5,407.89/7,418.91 = 5,356.86/x
3. Step 3: Cross multiply
   5,407.89x = 7,418.91 × 5,356.86
4. Step 4: Simplify right side
   5,407.89x = 39,742,062.22
5. Step 5: Solve for x
   x = 39,742,062.22/5,407.89
6. Step 6: Final answer
   x = 7,348.90