Finding the Fourth Proportional to 256,870.44, 385,210.89 and 88,343.87

Step by Step Solution

1. Step 1: Write the proportion equation
   256,870.44 : 385,210.89 = 88,343.87 : x
2. Step 2: Convert to fraction form
   256,870.44/385,210.89 = 88,343.87/x
3. Step 3: Cross multiply
   256,870.44x = 385,210.89 × 88,343.87
4. Step 4: Simplify right side
   256,870.44x = 34,031,018,862.69
5. Step 5: Solve for x
   x = 34,031,018,862.69/256,870.44
6. Step 6: Final answer
   x = 132,483.20