Finding the Fourth Proportional to 67,900.72, 101,851.14 and 21,153.60

Step by Step Solution

1. Step 1: Write the proportion equation
   67,900.72 : 101,851.14 = 21,153.60 : x
2. Step 2: Convert to fraction form
   67,900.72/101,851.14 = 21,153.60/x
3. Step 3: Cross multiply
   67,900.72x = 101,851.14 × 21,153.60
4. Step 4: Simplify right side
   67,900.72x = 2,154,518,275.10
5. Step 5: Solve for x
   x = 2,154,518,275.10/67,900.72
6. Step 6: Final answer
   x = 31,730.42