Finding the Fourth Proportional to 1,390,018.50, 1,918,212.57 and 786,406.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,018.50 : 1,918,212.57 = 786,406.50 : x
2. Step 2: Convert to fraction form
   1,390,018.50/1,918,212.57 = 786,406.50/x
3. Step 3: Cross multiply
   1,390,018.50x = 1,918,212.57 × 786,406.50
4. Step 4: Simplify right side
   1,390,018.50x = 1,508,494,833,429.71
5. Step 5: Solve for x
   x = 1,508,494,833,429.71/1,390,018.50
6. Step 6: Final answer
   x = 1,085,233.64