Finding the Third Proportional to 12,791,090 and 19,680,670

Step by Step Solution

1. Step 1: Write the proportion equation
   12,791,090 : 19,680,670 = 19,680,670 : x
2. Step 2: Convert to fraction form
   12,791,090/19,680,670 = 19,680,670/x
3. Step 3: Cross multiply
   12,791,090x = 19,680,670 × 19,680,670
4. Step 4: Simplify right side
   12,791,090x = 387,328,771,648,900
5. Step 5: Solve for x
   x = 387,328,771,648,900/12,791,090
6. Step 6: Final answer
   x = 30,281,138.80