Finding the Fourth Proportional to 13,290.56, 19,937.66 and 3,931.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.56 : 19,937.66 = 3,931.31 : x
2. Step 2: Convert to fraction form
   13,290.56/19,937.66 = 3,931.31/x
3. Step 3: Cross multiply
   13,290.56x = 19,937.66 × 3,931.31
4. Step 4: Simplify right side
   13,290.56x = 78,381,152.32
5. Step 5: Solve for x
   x = 78,381,152.32/13,290.56
6. Step 6: Final answer
   x = 5,897.51