Finding the Fourth Proportional to 761,638.58, 1,051,061.26 and 422,128.70

Step by Step Solution

1. Step 1: Write the proportion equation
   761,638.58 : 1,051,061.26 = 422,128.70 : x
2. Step 2: Convert to fraction form
   761,638.58/1,051,061.26 = 422,128.70/x
3. Step 3: Cross multiply
   761,638.58x = 1,051,061.26 × 422,128.70
4. Step 4: Simplify right side
   761,638.58x = 443,683,123,304.16
5. Step 5: Solve for x
   x = 443,683,123,304.16/761,638.58
6. Step 6: Final answer
   x = 582,537.62