Finding the Fourth Proportional to 291,300.79, 436,998.29 and 86,156.25

Step by Step Solution

1. Step 1: Write the proportion equation
   291,300.79 : 436,998.29 = 86,156.25 : x
2. Step 2: Convert to fraction form
   291,300.79/436,998.29 = 86,156.25/x
3. Step 3: Cross multiply
   291,300.79x = 436,998.29 × 86,156.25
4. Step 4: Simplify right side
   291,300.79x = 37,650,133,922.81
5. Step 5: Solve for x
   x = 37,650,133,922.81/291,300.79
6. Step 6: Final answer
   x = 129,248.31