Finding the Fourth Proportional to 7,297.86, 10,111.72 and 7,140.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,297.86 : 10,111.72 = 7,140.21 : x
2. Step 2: Convert to fraction form
   7,297.86/10,111.72 = 7,140.21/x
3. Step 3: Cross multiply
   7,297.86x = 10,111.72 × 7,140.21
4. Step 4: Simplify right side
   7,297.86x = 72,199,804.26
5. Step 5: Solve for x
   x = 72,199,804.26/7,297.86
6. Step 6: Final answer
   x = 9,893.29