Finding the Fourth Proportional to 12,656.86, 18,987.10 and 3,892.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,656.86 : 18,987.10 = 3,892.51 : x
2. Step 2: Convert to fraction form
   12,656.86/18,987.10 = 3,892.51/x
3. Step 3: Cross multiply
   12,656.86x = 18,987.10 × 3,892.51
4. Step 4: Simplify right side
   12,656.86x = 73,907,476.62
5. Step 5: Solve for x
   x = 73,907,476.62/12,656.86
6. Step 6: Final answer
   x = 5,839.32