Finding the Fourth Proportional to 613,092.72, 845,588.66 and 398,301.98

Step by Step Solution

1. Step 1: Write the proportion equation
   613,092.72 : 845,588.66 = 398,301.98 : x
2. Step 2: Convert to fraction form
   613,092.72/845,588.66 = 398,301.98/x
3. Step 3: Cross multiply
   613,092.72x = 845,588.66 × 398,301.98
4. Step 4: Simplify right side
   613,092.72x = 336,799,637,543.55
5. Step 5: Solve for x
   x = 336,799,637,543.55/613,092.72
6. Step 6: Final answer
   x = 549,345.35