Finding the Third Proportional to 179,478,964 and 390,404,288

Step by Step Solution

1. Step 1: Write the proportion equation
   179,478,964 : 390,404,288 = 390,404,288 : x
2. Step 2: Convert to fraction form
   179,478,964/390,404,288 = 390,404,288/x
3. Step 3: Cross multiply
   179,478,964x = 390,404,288 × 390,404,288
4. Step 4: Simplify right side
   179,478,964x = 152,415,508,088,786,944
5. Step 5: Solve for x
   x = 152,415,508,088,786,944/179,478,964
6. Step 6: Final answer
   x = 849,210,986.58