Finding the Fourth Proportional to 152,274.72, 210,139.60 and 85,206.56

Step by Step Solution

1. Step 1: Write the proportion equation
   152,274.72 : 210,139.60 = 85,206.56 : x
2. Step 2: Convert to fraction form
   152,274.72/210,139.60 = 85,206.56/x
3. Step 3: Cross multiply
   152,274.72x = 210,139.60 × 85,206.56
4. Step 4: Simplify right side
   152,274.72x = 17,905,272,435.78
5. Step 5: Solve for x
   x = 17,905,272,435.78/152,274.72
6. Step 6: Final answer
   x = 117,585.32