Finding the Fourth Proportional to 13,256.79, 19,888.55 and 3,897.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,256.79 : 19,888.55 = 3,897.13 : x
2. Step 2: Convert to fraction form
   13,256.79/19,888.55 = 3,897.13/x
3. Step 3: Cross multiply
   13,256.79x = 19,888.55 × 3,897.13
4. Step 4: Simplify right side
   13,256.79x = 77,508,264.86
5. Step 5: Solve for x
   x = 77,508,264.86/13,256.79
6. Step 6: Final answer
   x = 5,846.68