Finding the Fourth Proportional to 9,870.76, 13,621.16 and 5,393.66

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.76 : 13,621.16 = 5,393.66 : x
2. Step 2: Convert to fraction form
   9,870.76/13,621.16 = 5,393.66/x
3. Step 3: Cross multiply
   9,870.76x = 13,621.16 × 5,393.66
4. Step 4: Simplify right side
   9,870.76x = 73,467,851.22
5. Step 5: Solve for x
   x = 73,467,851.22/9,870.76
6. Step 6: Final answer
   x = 7,442.98