Finding the Fourth Proportional to 890,978.05, 1,337,607.56 and 765,421.57

Step by Step Solution

1. Step 1: Write the proportion equation
   890,978.05 : 1,337,607.56 = 765,421.57 : x
2. Step 2: Convert to fraction form
   890,978.05/1,337,607.56 = 765,421.57/x
3. Step 3: Cross multiply
   890,978.05x = 1,337,607.56 × 765,421.57
4. Step 4: Simplify right side
   890,978.05x = 1,023,833,678,619.07
5. Step 5: Solve for x
   x = 1,023,833,678,619.07/890,978.05
6. Step 6: Final answer
   x = 1,149,112.12