Finding the Fourth Proportional to 716,642.33, 988,953.89 and 389,944.31

Step by Step Solution

1. Step 1: Write the proportion equation
   716,642.33 : 988,953.89 = 389,944.31 : x
2. Step 2: Convert to fraction form
   716,642.33/988,953.89 = 389,944.31/x
3. Step 3: Cross multiply
   716,642.33x = 988,953.89 × 389,944.31
4. Step 4: Simplify right side
   716,642.33x = 385,636,945,705.11
5. Step 5: Solve for x
   x = 385,636,945,705.11/716,642.33
6. Step 6: Final answer
   x = 538,116.34