Finding the Third Proportional to 5,578,376 and 8,613,615

Step by Step Solution

1. Step 1: Write the proportion equation
   5,578,376 : 8,613,615 = 8,613,615 : x
2. Step 2: Convert to fraction form
   5,578,376/8,613,615 = 8,613,615/x
3. Step 3: Cross multiply
   5,578,376x = 8,613,615 × 8,613,615
4. Step 4: Simplify right side
   5,578,376x = 74,194,363,368,225
5. Step 5: Solve for x
   x = 74,194,363,368,225/5,578,376
6. Step 6: Final answer
   x = 13,300,351.82