Finding the Fourth Proportional to 156,930.51, 236,249.72 and 142,980.15

Step by Step Solution

1. Step 1: Write the proportion equation
   156,930.51 : 236,249.72 = 142,980.15 : x
2. Step 2: Convert to fraction form
   156,930.51/236,249.72 = 142,980.15/x
3. Step 3: Cross multiply
   156,930.51x = 236,249.72 × 142,980.15
4. Step 4: Simplify right side
   156,930.51x = 33,779,020,403.06
5. Step 5: Solve for x
   x = 33,779,020,403.06/156,930.51
6. Step 6: Final answer
   x = 215,248.27