Finding the Fourth Proportional to 431,191.55, 646,931.27 and 191,272.35

Step by Step Solution

1. Step 1: Write the proportion equation
   431,191.55 : 646,931.27 = 191,272.35 : x
2. Step 2: Convert to fraction form
   431,191.55/646,931.27 = 191,272.35/x
3. Step 3: Cross multiply
   431,191.55x = 646,931.27 × 191,272.35
4. Step 4: Simplify right side
   431,191.55x = 123,740,063,345.02
5. Step 5: Solve for x
   x = 123,740,063,345.02/431,191.55
6. Step 6: Final answer
   x = 286,972.38