Finding the Fourth Proportional to 1,161,131.76, 1,602,365.54 and 644,885.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,161,131.76 : 1,602,365.54 = 644,885.55 : x
2. Step 2: Convert to fraction form
   1,161,131.76/1,602,365.54 = 644,885.55/x
3. Step 3: Cross multiply
   1,161,131.76x = 1,602,365.54 × 644,885.55
4. Step 4: Simplify right side
   1,161,131.76x = 1,033,342,379,339.52
5. Step 5: Solve for x
   x = 1,033,342,379,339.52/1,161,131.76
6. Step 6: Final answer
   x = 889,944.12