Finding the Third Proportional to 52,160 and 78,490

Step by Step Solution

1. Step 1: Write the proportion equation
   52,160 : 78,490 = 78,490 : x
2. Step 2: Convert to fraction form
   52,160/78,490 = 78,490/x
3. Step 3: Cross multiply
   52,160x = 78,490 × 78,490
4. Step 4: Simplify right side
   52,160x = 6,160,680,100
5. Step 5: Solve for x
   x = 6,160,680,100/52,160
6. Step 6: Final answer
   x = 118,111.20