Finding the Fourth Proportional to 12,870.62, 19,308.77 and 7,326.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.62 : 19,308.77 = 7,326.58 : x
2. Step 2: Convert to fraction form
   12,870.62/19,308.77 = 7,326.58/x
3. Step 3: Cross multiply
   12,870.62x = 19,308.77 × 7,326.58
4. Step 4: Simplify right side
   12,870.62x = 141,467,248.11
5. Step 5: Solve for x
   x = 141,467,248.11/12,870.62
6. Step 6: Final answer
   x = 10,991.49