Finding the Third Proportional to 641,754,740 and 1,406,538,072

Step by Step Solution

1. Step 1: Write the proportion equation
   641,754,740 : 1,406,538,072 = 1,406,538,072 : x
2. Step 2: Convert to fraction form
   641,754,740/1,406,538,072 = 1,406,538,072/x
3. Step 3: Cross multiply
   641,754,740x = 1,406,538,072 × 1,406,538,072
4. Step 4: Simplify right side
   641,754,740x = 1,978,349,347,985,477,120
5. Step 5: Solve for x
   x = 1,978,349,347,985,477,120/641,754,740
6. Step 6: Final answer
   x = 3,082,718,715.85