Finding the Third Proportional to 55,390,279.50 and 128,218,470

Step by Step Solution

1. Step 1: Write the proportion equation
   55,390,279.50 : 128,218,470 = 128,218,470 : x
2. Step 2: Convert to fraction form
   55,390,279.50/128,218,470 = 128,218,470/x
3. Step 3: Cross multiply
   55,390,279.50x = 128,218,470 × 128,218,470
4. Step 4: Simplify right side
   55,390,279.50x = 16,439,976,049,140,900
5. Step 5: Solve for x
   x = 16,439,976,049,140,900/55,390,279.50
6. Step 6: Final answer
   x = 296,802,547.26