Finding the Fourth Proportional to 152,196, 210,031.20 and 85,128

Step by Step Solution

1. Step 1: Write the proportion equation
   152,196 : 210,031.20 = 85,128 : x
2. Step 2: Convert to fraction form
   152,196/210,031.20 = 85,128/x
3. Step 3: Cross multiply
   152,196x = 210,031.20 × 85,128
4. Step 4: Simplify right side
   152,196x = 17,879,535,993.60
5. Step 5: Solve for x
   x = 17,879,535,993.60/152,196
6. Step 6: Final answer
   x = 117,477.04