Finding the Third Proportional to 123,210,688 and 189,400,352

Step by Step Solution

1. Step 1: Write the proportion equation
   123,210,688 : 189,400,352 = 189,400,352 : x
2. Step 2: Convert to fraction form
   123,210,688/189,400,352 = 189,400,352/x
3. Step 3: Cross multiply
   123,210,688x = 189,400,352 × 189,400,352
4. Step 4: Simplify right side
   123,210,688x = 35,872,493,337,723,904
5. Step 5: Solve for x
   x = 35,872,493,337,723,904/123,210,688
6. Step 6: Final answer
   x = 291,147,577.54