Finding the Third Proportional to 478,742 and 728,060.75

Step by Step Solution

1. Step 1: Write the proportion equation
   478,742 : 728,060.75 = 728,060.75 : x
2. Step 2: Convert to fraction form
   478,742/728,060.75 = 728,060.75/x
3. Step 3: Cross multiply
   478,742x = 728,060.75 × 728,060.75
4. Step 4: Simplify right side
   478,742x = 530,072,455,690.56
5. Step 5: Solve for x
   x = 530,072,455,690.56/478,742
6. Step 6: Final answer
   x = 1,107,219.45