Finding the Fourth Proportional to 1,320,646.98, 1,977,580.71 and 915,261.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320,646.98 : 1,977,580.71 = 915,261.42 : x
2. Step 2: Convert to fraction form
   1,320,646.98/1,977,580.71 = 915,261.42/x
3. Step 3: Cross multiply
   1,320,646.98x = 1,977,580.71 × 915,261.42
4. Step 4: Simplify right side
   1,320,646.98x = 1,810,003,328,799.21
5. Step 5: Solve for x
   x = 1,810,003,328,799.21/1,320,646.98
6. Step 6: Final answer
   x = 1,370,542.89