Finding the Fourth Proportional to 1,152,620.19, 1,590,608.37 and 636,406.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152,620.19 : 1,590,608.37 = 636,406.18 : x
2. Step 2: Convert to fraction form
   1,152,620.19/1,590,608.37 = 636,406.18/x
3. Step 3: Cross multiply
   1,152,620.19x = 1,590,608.37 × 636,406.18
4. Step 4: Simplify right side
   1,152,620.19x = 1,012,272,995,037.73
5. Step 5: Solve for x
   x = 1,012,272,995,037.73/1,152,620.19
6. Step 6: Final answer
   x = 878,236.39