Finding the Third Proportional to 156,213 and 343,145.25

Step by Step Solution

1. Step 1: Write the proportion equation
   156,213 : 343,145.25 = 343,145.25 : x
2. Step 2: Convert to fraction form
   156,213/343,145.25 = 343,145.25/x
3. Step 3: Cross multiply
   156,213x = 343,145.25 × 343,145.25
4. Step 4: Simplify right side
   156,213x = 117,748,662,597.56
5. Step 5: Solve for x
   x = 117,748,662,597.56/156,213
6. Step 6: Final answer
   x = 753,769.93