Finding the Fourth Proportional to 15,488.61, 21,374.72 and 8,415.46

Step by Step Solution

1. Step 1: Write the proportion equation
   15,488.61 : 21,374.72 = 8,415.46 : x
2. Step 2: Convert to fraction form
   15,488.61/21,374.72 = 8,415.46/x
3. Step 3: Cross multiply
   15,488.61x = 21,374.72 × 8,415.46
4. Step 4: Simplify right side
   15,488.61x = 179,878,101.17
5. Step 5: Solve for x
   x = 179,878,101.17/15,488.61
6. Step 6: Final answer
   x = 11,613.57