Finding the Third Proportional to 72,315 and 156,931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,315 : 156,931.50 = 156,931.50 : x
2. Step 2: Convert to fraction form
   72,315/156,931.50 = 156,931.50/x
3. Step 3: Cross multiply
   72,315x = 156,931.50 × 156,931.50
4. Step 4: Simplify right side
   72,315x = 24,627,495,692.25
5. Step 5: Solve for x
   x = 24,627,495,692.25/72,315
6. Step 6: Final answer
   x = 340,558.61