Finding the Fourth Proportional to 28,140.23, 42,216.59 and 10,610.21

Step by Step Solution

1. Step 1: Write the proportion equation
   28,140.23 : 42,216.59 = 10,610.21 : x
2. Step 2: Convert to fraction form
   28,140.23/42,216.59 = 10,610.21/x
3. Step 3: Cross multiply
   28,140.23x = 42,216.59 × 10,610.21
4. Step 4: Simplify right side
   28,140.23x = 447,926,832.33
5. Step 5: Solve for x
   x = 447,926,832.33/28,140.23
6. Step 6: Final answer
   x = 15,917.67