Finding the Third Proportional to 371,430 and 558,031.50

Step by Step Solution

1. Step 1: Write the proportion equation
   371,430 : 558,031.50 = 558,031.50 : x
2. Step 2: Convert to fraction form
   371,430/558,031.50 = 558,031.50/x
3. Step 3: Cross multiply
   371,430x = 558,031.50 × 558,031.50
4. Step 4: Simplify right side
   371,430x = 311,399,154,992.25
5. Step 5: Solve for x
   x = 311,399,154,992.25/371,430
6. Step 6: Final answer
   x = 838,379.12