Finding the Fourth Proportional to 478,602, 660,479.00 and 309,131.37

Step by Step Solution

1. Step 1: Write the proportion equation
   478,602 : 660,479.00 = 309,131.37 : x
2. Step 2: Convert to fraction form
   478,602/660,479.00 = 309,131.37/x
3. Step 3: Cross multiply
   478,602x = 660,479.00 × 309,131.37
4. Step 4: Simplify right side
   478,602x = 204,174,776,580.57
5. Step 5: Solve for x
   x = 204,174,776,580.57/478,602
6. Step 6: Final answer
   x = 426,606.61