Finding the Fourth Proportional to 1,405,069.31, 1,939,042.59 and 861,100

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405,069.31 : 1,939,042.59 = 861,100 : x
2. Step 2: Convert to fraction form
   1,405,069.31/1,939,042.59 = 861,100/x
3. Step 3: Cross multiply
   1,405,069.31x = 1,939,042.59 × 861,100
4. Step 4: Simplify right side
   1,405,069.31x = 1,669,709,574,249
5. Step 5: Solve for x
   x = 1,669,709,574,249/1,405,069.31
6. Step 6: Final answer
   x = 1,188,346.77