Finding the Fourth Proportional to 155,858.71, 215,080.71 and 87,875.09

Step by Step Solution

1. Step 1: Write the proportion equation
   155,858.71 : 215,080.71 = 87,875.09 : x
2. Step 2: Convert to fraction form
   155,858.71/215,080.71 = 87,875.09/x
3. Step 3: Cross multiply
   155,858.71x = 215,080.71 × 87,875.09
4. Step 4: Simplify right side
   155,858.71x = 18,900,236,748.51
5. Step 5: Solve for x
   x = 18,900,236,748.51/155,858.71
6. Step 6: Final answer
   x = 121,265.19