Finding the Fourth Proportional to 2,057,928.90, 3,087,009.99 and 638,186.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057,928.90 : 3,087,009.99 = 638,186.82 : x
2. Step 2: Convert to fraction form
   2,057,928.90/3,087,009.99 = 638,186.82/x
3. Step 3: Cross multiply
   2,057,928.90x = 3,087,009.99 × 638,186.82
4. Step 4: Simplify right side
   2,057,928.90x = 1,970,089,088,826.33
5. Step 5: Solve for x
   x = 1,970,089,088,826.33/2,057,928.90
6. Step 6: Final answer
   x = 957,316.40