Finding the Fourth Proportional to 21,061.08, 31,607.94 and 7,925.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.08 : 31,607.94 = 7,925.40 : x
2. Step 2: Convert to fraction form
   21,061.08/31,607.94 = 7,925.40/x
3. Step 3: Cross multiply
   21,061.08x = 31,607.94 × 7,925.40
4. Step 4: Simplify right side
   21,061.08x = 250,505,567.68
5. Step 5: Solve for x
   x = 250,505,567.68/21,061.08
6. Step 6: Final answer
   x = 11,894.24