Finding the Fourth Proportional to 40,488, 60,741.72 and 12,786

Step by Step Solution

1. Step 1: Write the proportion equation
   40,488 : 60,741.72 = 12,786 : x
2. Step 2: Convert to fraction form
   40,488/60,741.72 = 12,786/x
3. Step 3: Cross multiply
   40,488x = 60,741.72 × 12,786
4. Step 4: Simplify right side
   40,488x = 776,643,631.92
5. Step 5: Solve for x
   x = 776,643,631.92/40,488
6. Step 6: Final answer
   x = 19,182.07