Finding the Fourth Proportional to 1,389,105.60, 1,947,547.20 and 1,389,105.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389,105.60 : 1,947,547.20 = 1,389,105.60 : x
2. Step 2: Convert to fraction form
   1,389,105.60/1,947,547.20 = 1,389,105.60/x
3. Step 3: Cross multiply
   1,389,105.60x = 1,947,547.20 × 1,389,105.60
4. Step 4: Simplify right side
   1,389,105.60x = 2,705,348,721,784.32
5. Step 5: Solve for x
   x = 2,705,348,721,784.32/1,389,105.60
6. Step 6: Final answer
   x = 1,947,547.20