Finding the Fourth Proportional to 1,623,141.72, 2,238,554.88 and 978,427.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,623,141.72 : 2,238,554.88 = 978,427.08 : x
2. Step 2: Convert to fraction form
   1,623,141.72/2,238,554.88 = 978,427.08/x
3. Step 3: Cross multiply
   1,623,141.72x = 2,238,554.88 × 978,427.08
4. Step 4: Simplify right side
   1,623,141.72x = 2,190,262,714,658.15
5. Step 5: Solve for x
   x = 2,190,262,714,658.15/1,623,141.72
6. Step 6: Final answer
   x = 1,349,397.09