Finding the Third Proportional to 185,300,415 and 399,320,730

Step by Step Solution

1. Step 1: Write the proportion equation
   185,300,415 : 399,320,730 = 399,320,730 : x
2. Step 2: Convert to fraction form
   185,300,415/399,320,730 = 399,320,730/x
3. Step 3: Cross multiply
   185,300,415x = 399,320,730 × 399,320,730
4. Step 4: Simplify right side
   185,300,415x = 159,457,045,407,732,896
5. Step 5: Solve for x
   x = 159,457,045,407,732,896/185,300,415
6. Step 6: Final answer
   x = 860,532,586.54