Finding the Fourth Proportional to 1,391,112.74, 1,916,458.18 and 1,307,410.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,112.74 : 1,916,458.18 = 1,307,410.78 : x
2. Step 2: Convert to fraction form
   1,391,112.74/1,916,458.18 = 1,307,410.78/x
3. Step 3: Cross multiply
   1,391,112.74x = 1,916,458.18 × 1,307,410.78
4. Step 4: Simplify right side
   1,391,112.74x = 2,505,598,074,368.89
5. Step 5: Solve for x
   x = 2,505,598,074,368.89/1,391,112.74
6. Step 6: Final answer
   x = 1,801,146.67