Finding the Third Proportional to 136,788 and 210,123

Step by Step Solution

1. Step 1: Write the proportion equation
   136,788 : 210,123 = 210,123 : x
2. Step 2: Convert to fraction form
   136,788/210,123 = 210,123/x
3. Step 3: Cross multiply
   136,788x = 210,123 × 210,123
4. Step 4: Simplify right side
   136,788x = 44,151,675,129
5. Step 5: Solve for x
   x = 44,151,675,129/136,788
6. Step 6: Final answer
   x = 322,774.48