Finding the Fourth Proportional to 1,390,162.71, 1,917,978.42 and 778,225.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,162.71 : 1,917,978.42 = 778,225.35 : x
2. Step 2: Convert to fraction form
   1,390,162.71/1,917,978.42 = 778,225.35/x
3. Step 3: Cross multiply
   1,390,162.71x = 1,917,978.42 × 778,225.35
4. Step 4: Simplify right side
   1,390,162.71x = 1,492,619,427,196.95
5. Step 5: Solve for x
   x = 1,492,619,427,196.95/1,390,162.71
6. Step 6: Final answer
   x = 1,073,701.24