Finding the Fourth Proportional to 1,535,499.98, 2,119,669.42 and 991,900.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535,499.98 : 2,119,669.42 = 991,900.78 : x
2. Step 2: Convert to fraction form
   1,535,499.98/2,119,669.42 = 991,900.78/x
3. Step 3: Cross multiply
   1,535,499.98x = 2,119,669.42 × 991,900.78
4. Step 4: Simplify right side
   1,535,499.98x = 2,102,501,751,040.15
5. Step 5: Solve for x
   x = 2,102,501,751,040.15/1,535,499.98
6. Step 6: Final answer
   x = 1,369,261.99