Finding the Fourth Proportional to 469,860, 648,945 and 309,432.12

Step by Step Solution

1. Step 1: Write the proportion equation
   469,860 : 648,945 = 309,432.12 : x
2. Step 2: Convert to fraction form
   469,860/648,945 = 309,432.12/x
3. Step 3: Cross multiply
   469,860x = 648,945 × 309,432.12
4. Step 4: Simplify right side
   469,860x = 200,804,427,113.40
5. Step 5: Solve for x
   x = 200,804,427,113.40/469,860
6. Step 6: Final answer
   x = 427,370.76