Finding the Third Proportional to 179,300 and 390,140

Step by Step Solution

1. Step 1: Write the proportion equation
   179,300 : 390,140 = 390,140 : x
2. Step 2: Convert to fraction form
   179,300/390,140 = 390,140/x
3. Step 3: Cross multiply
   179,300x = 390,140 × 390,140
4. Step 4: Simplify right side
   179,300x = 152,209,219,600
5. Step 5: Solve for x
   x = 152,209,219,600/179,300
6. Step 6: Final answer
   x = 848,908.08