Finding the Fourth Proportional to 1,138,300.42, 1,570,832.85 and 628,991.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,138,300.42 : 1,570,832.85 = 628,991.86 : x
2. Step 2: Convert to fraction form
   1,138,300.42/1,570,832.85 = 628,991.86/x
3. Step 3: Cross multiply
   1,138,300.42x = 1,570,832.85 × 628,991.86
4. Step 4: Simplify right side
   1,138,300.42x = 988,041,076,070.60
5. Step 5: Solve for x
   x = 988,041,076,070.60/1,138,300.42
6. Step 6: Final answer
   x = 867,996.76