Finding the Fourth Proportional to 612,131.67, 918,051.71 and 257,152.59

Step by Step Solution

1. Step 1: Write the proportion equation
   612,131.67 : 918,051.71 = 257,152.59 : x
2. Step 2: Convert to fraction form
   612,131.67/918,051.71 = 257,152.59/x
3. Step 3: Cross multiply
   612,131.67x = 918,051.71 × 257,152.59
4. Step 4: Simplify right side
   612,131.67x = 236,079,373,694.67
5. Step 5: Solve for x
   x = 236,079,373,694.67/612,131.67
6. Step 6: Final answer
   x = 385,667.64